I wear a size 10 pant, 40-inch hips and I bought size Large and they fit great. They do a nice job of smoothing out (these are not firm control) my post-baby belly so I can look like I'm not pregnant in a
dress. Sometimes they roll a little bit, but not anything like other shaper panties I have tried, so I don't have to worry about tugging them back into place all the time. They are also nice for those days when my waistband on my
pants is a little tight. I'm back to order 2 more!